1080. 4 1080. 4
• Cement Concrete Structures. Section 1001.4
• Fabricated Structural Steel. Section 1050.4
• High Load Multi -Rotational Bearings. Section 1050.4
• Reset Expansion Bearings, Prestressed Concrete Superstructure. Each 1085.1 1085. 2(m)
1085.1DESCRIPTION —This work is the manufacture, storage, delivery, installation, and assembly of
precast reinforced concrete box culvert segments into one continuous unit.
1085.2MATERIAL —
and Washers. Section 1105.02(d)
Furnish , test, and place cement concrete as specified in Section 7 14.7; except, with a minimum 28 -day compressive strength of 5,000 pounds per square inch or as shown on the approved shop drawings . Provide concrete as specified in Section 704 and meeting the specified compressive strength or other requirements shown on the approved shop drawings. AASHTO M 259/M 259M or M 273/M 273M; except, modify Section 11, Permissible Variations according to Form TR-28 and as follows:
• 11.1 Internal Dimensions . Do not allow the internal dimensions to vary from design by more than 1% with a maximum variation of 1 inch. Do not allow the internal diagonal dimensions to vary by more than 1 inch. Do not allow the haunch dimensions to vary more than 1/4 inch from design dimensions.
• 11.2 Slab and Wall Thickness . Do not allow slab and wall thickness to vary from design dimensions by more than plus 1/2 inch or minus 3/16 inch.
• 11.3 Length of Opposite Surface (square segments only ). Do not allow laying length of any opposite or opposing surfaces of the box segment to vary more than 1/8 inch/foot of the internal span, with a maximum of 5/8 inch.
• 11.5 Position of Reinforcement . Do not allow the position of the reinforcement to vary from the approved shop drawings by more than 1/2 inch in any direction. Place reinforcement so the indicated cover clearance does not deviate more than ± 1/4 inch. Provide 1 1/2 inch minimum cover at t he mating surface, as measured to the end of the joint.
Certify as specified in Section 106.03(b)3.